Making dictionaries: preserving indigenous languages of the Americas, edited by William Frawley, Kenneth C. Hill, Pamela Munro, several authors, ISBN 0-520-22996-7, pg 252. [http://books.google.es/books?id=Jbr1jAQO4iQC&printsec=frontcover&dq=making+dictionaries&hl=es&ei=7IR_TLi5MYnDswanj7n_Dw&sa=X&oi=book_result&ct=book-thumbnail&resnum=1&ved=0CC8Q6wEwAA#v=onepage&q=fontanel&f=false]</ref>